Market Structure and Optimal Stockholding: A Note
证明，投入品价格波动对垄断企业利润的影响大于竞争企业，因此垄断企业更有动机持有存货并参与期货市场。
Fluctuating input prices are shown to cause greater variability in the profits of monopolies than of competitive firms. Hence monopolies have greater incentives to hold input stocks and participate in futures markets than do competitive firms.